Audrey Liyang Chai, MD
Internal Medicine Physician · Palo Alto, CA
Audrey Liyang Chai, MD is an internal medicine physician with a practice address in Palo Alto, California, and NPI 1649807835, issued on Mar 26, 2020. Check the license (California 186492, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Audrey Liyang Chai
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 186492 CA
Self-reported in NPPES; status is on the state search - Practice location
- 500 Pasteur Dr, Palo Alto, CA 94304
- Phone
- (650) 723-4000
- Enumerated
- Mar 26, 2020
- Record last updated
- Jul 20, 2026
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 500 Pasteur Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Layla AboukhaterStudent in an Organized Health Care Education/Training Program1629867858
- Cresencio AdameCritical Care Medicine (Internal Medicine) Physician1750021564
- Aiman Alassar, MD, PHDThoracic Surgery (Cardiothoracic Vascular Surgery) Physician1316553878
- Prasannaraddi Alavandi, PHARMDOncology Pharmacist1932035482
- Abdurrasheed AlhadiEmergency Medicine Physician1174151617
- Zainab AlzawadRegistered Nurse1154298735
Verify Audrey Liyang Chai in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 186492Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average internal medicine physician in 2024
66 Medicare Part D claims for 20 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 41% of claims.
Most prescribed
- Albuterol Sulfate Hfa16 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Audrey Liyang Chai among 17,696 internal medicine physician records in California
Audrey Liyang Chai, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 89% of them.
- NPI issued2020 · 89% of these records are older, 8% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2026 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
187 internal medicine physician records list a practice address in Palo Alto
They are 187 of the 7,617 NPPES records with a practice address in Palo Alto, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Palo Alto → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Arlina Ahluwalia, MDPalo Alto, CA 943041295723559
- Bankole Asebiomo, MDPalo Alto, CA 943041841301884
- Lisa Backus, MD PHDPalo Alto, CA 943041033152285
- Mina Charon, MDPalo Alto, CA 943041558349266
- Stephen Ezeji-Okoye, M.D.Palo Alto, CA 943041366493595
- Susan Frayne, MD, MPHPalo Alto, CA 943041952314890
- James Hallenbeck, MDPalo Alto, CA 943041316982358
- Rhonda Hamilton, M.D.Palo Alto, CA 943041225063241
Common questions
What is Audrey Liyang Chai, MD's NPI number?
Audrey Liyang Chai, MD's National Provider Identifier (NPI) is 1649807835, issued on Mar 26, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Audrey Liyang Chai, MD located?
The NPPES record lists a practice address at 500 Pasteur Dr, Palo Alto, CA, 94304. Phone: (650) 723-4000. Providers update this record themselves, so call before visiting.
How can I verify Audrey Liyang Chai, MD's license?
NPPES lists California license number 186492, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Audrey Liyang Chai, MD prescribe under Medicare Part D?
In 2024, Audrey Liyang Chai, MD had 66 Medicare Part D claims for 20 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.